Applied emission, set strength quite low but still looks really over exposed, any ideas on how to correct? Doing The CG Fast Track Beginner Tutorial
You've connected an emission shader directly to the volume output for the world.  With this connection you're saying &quot;emit light from every point in the world&quot; so it pretty much doesn't matter how low you set the light, it's going to be pervasive.
Here I've used a principled volume node and used the density slider to control the amount of fog in the scene, then I made the fog emit just a bit of light.

I encourage you to take liberties with tutorials, because not only did I learn a lot that way, but you'll find yourself creating pieces with a personal touch.